Purification and characterization of Al13 species in coagulant polyaluminumchloride
GAO Baoyu , CHU Yongbao , YUE Qinyan , WANG Yan
DOI:
Received ,Revised , Accepted , Available online
Volume 21,2009,Pages 18-22
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Nano-Al13 was separated and purified by four methods to investigate its characteristic, and was analyzed by Al-Ferron timed
complexation spectrophotometer, 27Al-NMR (nuclear magnetic resonance), and transmission electron microscopy (TEM). Coagulation
e ciency of nano-Al13, polyaluminum chloride (PAC), and AlCl3 in synthetic water were also investigated by jar test. The dynamic
process and aggregation state of kaolin suspensions coagulating with nano-Al13, PAC, and AlCl3 were also investigated. The
experimental results indicated that the e ciency of gel column chromatography method was the highest for separating PAC solution
with low Al concentration. Ethanol and acetone method was simple and could separated PAC solution with di erent Al concentrations,
while silicon alkylation white block column chromatography method could separate PAC solution only with low Al concentration. The
SO4
2??/Ba2+ displacement method could separate PAC solution with high Al concentration, but extra inorganic cation and anion could
be introduced into the solution during the separation. The coagulation e ciency and dynamic experimental results showed that nano-
Al13 with a high positive-charged species was the main species of electric neutralization in coagulation process, and it could reduce the
turbidity and increase the e ective particles collision rate e ciently in coagulation process. Its coagulation speed and the particle size
of coagulant formed were of greatest value in this study.
